Trane RRU150F N Series Installation, Operation And Maintenance Manual page 46

Alarms and Troubleshooting
Table 8. TOAU UC600 alarms (continued)
Point Diagnostic
BAS communication down
OA Humidity Failed sensor or improper sensor
14
Source Failure installation
Humidity Wiring is polarity sensitive
Heat Overridden ON
Low discharge air volume
Dirty air filters
High Temp High gas heater manifold pressure
15
Lockout
OA/RA damper position incorrect
High temp limit not properly installed or
wired
DAT sensor malfunction
Check all Alarms
17 System Lockout
External safety device failed open
BAS communication down
Space RH Source Failed sensor or improper sensor
19
Failure installation
Humidity Wiring is polarity sensitive
Applies to 5:1 and 10:1 Gas Heaters Only
Trips after heat command "ON" and no GV
status offer 1 minute
Refer to unit "Service Facts" heat control
LED status legend
No gas, low gas pressure or high gas
42 Heat Failure
pressure to unit
Unit Manual shutoffs closed
Heater inducer failure
Heat relay failure
Loose or incorrect wiring
Table 9. TOAU UC600 troubleshooting
Trouble Possible Cause
No power supply to unit disconnect switch
Power disconnect tripped
Lockout alarm mode
Unit Not Running
Emergency Stop condition exists
Unit in Unoccupied mode
Discharge air sensor failed or not installed and
connected to unit
No gas supply to unit
Unit manual gas valve(s) closed
Heater high limit tripped
Heat relay not energized
Conditions do not warrant call for heat
No Heat
Heater control module malfunction
Roll out switch trip
Main gas on-off switch OFF
Inducer fan failure
Heater air proving switch not making or failed
46
Possible Cause
Table 9. TOAU UC600 troubleshooting (continued)
Trouble Possible Cause
Compressor limit switch(es) open
Compressor relay not energized or failed
No Compressor
Conditions do not warrant call for cooling or
dehumidification
Discharge air sensor position must be at least
4 ft.-0 in. away from unit outlet
Wide Discharge
Temp Swings
Min and Max gas heater manifold pressures not set
correctly
Setpoints not adjusted properly
Space too Hot,
Space sensors not correctly located or wired
Cold or Humid
Malfunctioning space sensor
Overcurrent alarm requires max Hz setting on VFD
IFM or PEX VFD OC
be checked and set to not exceed motor
Trip
nameplate amps
If supplied with RA pressure transducer and
EX VFD only run to
modulating damper setup is not installed or
Min HZ Setting
properly wired.
High fire gas manifold pressure too high
Supply fan speed too low
Dirty or clogged filters
Unit Trips Heater
High Limit
Restricted discharge air duct
Temperature of air entering heater too high
Defective high limit
Protonode Not
Change Baud rate on UC600 to 38,400
Communicating
RRU-SVX02F-EN